Casing-spear.



PATENTED OCT. 31, 1905.

' J. STEGNBR.

CASING SP APPLICATION FILED EAR.

MAY 3. 1905.

Q/vitneowa No. 803,450. PATENTED OCT. 31. 1905.

' J. STEGNER.

CASING SPEAR.

APPLICATION FILED In a, 1905.

2 SHEETS-SHEET 2.

new. a. mum! oo mm-unmuvuini, wqsumawn, 0. cv

JOHN STEGNER, OF LEW ISVILLE, OHIO.

CASING-SPEAR- Specification of Letters Patent.

Patented Oct. 31, 1905.-

Application filed May 3, 1905. Serial No- 258,707.

To all whom it may concern:

Be it known that I, JOHN STEGNER, a citizen of the United States,residing at Lewisville, in the county of Monroe, State of Ohio, haveinvented certain new and useful Improvements in Casing-Spears; and I dohereby declare the following to be a full, clear, and exact descriptionof theinvention, such as will enable others skilled in the art to whichit appertains to make and use the same.

This invention relates to grips, and more particularly to those designedfor use in removing loose casings from deep wells, and has for itsobject to provide a grip of this kind which may be operated byfluid-pressure to securely engage a casing.

Another object is to provide a grip which will be simple in arrangementand which may be manufactured at a low figure.

Other objects and advantages will be apparent from the followingdescription, and it will be understood that changes in the specificconstruction shown and described may be made within the scope of theclaims, and that any suitable materials may be used without departingfrom the spirit of the invention.

In the drawings forming a portion of this specification, and in whichlike numerals of reference indicate similar parts in the several views,Figure 1 is a side elevation of the present grip. Fig. 2 is alongitudinal section of Fig. 1. Fig. 3 is a view similar to Fig. 2,showing the grip engaged at its upper end with a casing and having itsgripping members engaged within a second casing, the latter being shownin section. Fig. 4 is a section on line 4: 1 of Fig. 1 looking towardthe gripping members.

Referring now to the drawings, the present invention comprises avertically-extending cylinder 5, which is exteriorly threaded at itsupper end, as shown at 6, for engagement in the lower end of a sectionof casing 7, as shown. The lower end of the cylinder is closed by aplate 7, having a central circular opening 8 therein, in which there isengaged the upper end of an upwardly-tapered stem 9, enlarged into ahead 10 at its lower end.

Slidably disposed within the cylinder 5 there is a piston 11, which hasengaged therein the upper ends of a plurality of rods 12, which extenddownwardly through perforations 13 in the plate 7 and which are arrangedin a series surrounding the stem 9. A helical spring 14 is disposedwithin the cylinder between the piston 11 and the plate 7 and holds thepiston yieldably at the upward limit of its movement.

A plurality of gripping members 15 are provided, havingupwardly-extending stems 16,

l which are pivoted between spaced cars 17,

carried by the stem 9 adjacent to its lower end, and the outer faces ofthese members 15 are transversely convex and are provided withtransverse upwardly-directed teeth 18. The lower ends of the rods 12 arepivoted to the stems 16 in such a way that when the rods are moveddownwardly, as will be presently described, the stems 16 will be movedinwardly toward the stem 9 and the gripping members 15 will be moved toextend outwardly from the stem 9.

Engaged with the stem 9 there is a split spring-ring 19, which lieswithin the inclosure of the stems 16 and rests against the inner facesthereof, the action of this spring-ring being to hold the members 15yieldably against the stem 9, as will be readily understood.

In use the upper end of the cylinder 5 is engaged with the lower end ofa casing, and the instrument and casing are then introduced into a wellfrom which a loose section of casing is to be withdrawn, the lowerportion of the instrument and the gripping members being introduced intothe upper end of the loose casing. The downwardly-extending head 10 ofthe instrument protects the gripping members 15, which might otherwisecome into engagement with the bottom of the well or with obstructions inthe loose casing. After the instrument has been thus disposed water orother fluid is directed into the casing 7 and the pressure of this fluidupon the piston 11 moves this piston downwardly, this operation rockingthe stems 16 upon their pivots with their upper portion moving inwardlyand bringing the teeth of the members 15 into engagement with the innerface of the loose casing. The fluid Within the casing 7 as will beunderstood, is under suflicient pressure to cause the members 15 totightly engage the casing in order that they may not slip therefrom. Itwill be understood that the movement of the stems .16, as justdescribed, is against the action of the spring 14: and that when thepressure within the casing 7 is removed this spring Wlll return thegripping members to their original positions to release the loosecasing, it being understood that this pressure is removed after theloose casing has been Withdrawn from the Well.

What is claimed is 1. A device of the class described comprising a stemarranged for introduction into a well-casing, gripping members carriedby the stem and movable with respect thereto into and out of position toengage the inner surface of a casing Within which the stem lies, meansfor holding the members yieldably out of such position and meansoperable by fluidpressure for moving the gripping members against theaction of the holding means.

2. A device of the class described comprising a stem adapted forengagement Within a well-casing, casing-engaging members carried by thestem and movable into and out of operative position, means for holdingsaid members yieldably in inoperative position and means operable byfluid-pressure for moving the members against the action of the holdingmeans.

In testimony whereof I aifix my signature in presence of two Witnesses.

JOHN STEGNER.

Witnesses:

GLEMENGE J. STEGNER, CHARLES W. STEGNER.

